apr
Repo.stream + Flow.from_enumerable
I have the following code
Repo.transaction(fn -> Blog |> where(title: ^title) |> Repo.stream() |> Flow.from_enumerable() |> Flow.each(fn x -> IO.inspect x end) |> Flow.run() end)
When I run this, I get the error: (RuntimeError) cannot reduce stream outside of transaction
Is Ecto and Flow not supposed to be used in this manner?
Thanks!
Marked As Solved
mbuhot
I believe the stream must be used in the same process that created the transaction.
There was some work towards GenStage integration in Ecto: Introduce Ecto.Adapters.SQL.Stage by fishcakez · Pull Request #2028 · elixir-ecto/ecto · GitHub but it’s been closed.
Also Liked
josevalim
We will support this likely on Ecto 3.1. It won’t make the cut for Ecto 3.0 but it is planned to happen at some point.
josevalim
It has not. Unless someone works on it (or sponsors someone do to the work), it is unlikely to be added.
samuelralak
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